/*

 * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#import "config.h"

#import "Color.h"

#import "ColorMac.h"

#import <wtf/Assertions.h>

#import <wtf/RetainPtr.h>

@interface WebCoreControlTintObserver : NSObject

+ (void)controlTintDidChange;

@end

namespace WebCore {

// NSColor calls don't throw, so no need to block Cocoa exceptions in this file

static RGBA32 oldAquaFocusRingColor = 0xFF7DADD9;

static bool tintIsKnown;

static void (*tintChangeFunction)();

static RGBA32 systemFocusRingColor;

static bool useOldAquaFocusRingColor;

static RGBA32 makeRGBAFromNSColor(NSColor *c)

{

    return makeRGBA((int)(255 * [c redComponent]), (int)(255 * [c greenComponent]), (int)(255 * [c blueComponent]), (int)(255 * [c alphaComponent]));

}

Color colorFromNSColor(NSColor *c)

{

    return Color(makeRGBAFromNSColor(c));

}

NSColor* nsColor(const Color& color)

{

    unsigned c = color.rgb();

    switch (c) {

        case 0: {

            // Need this to avoid returning nil because cachedRGBAValues will default to 0.

            static RetainPtr<NSColor> clearColor = [NSColor clearColor];

            return clearColor.get();

        }

        case Color::black: {

            static RetainPtr<NSColor> blackColor = [NSColor blackColor];

            return blackColor.get();

        }

        case Color::white: {

            static RetainPtr<NSColor> whiteColor = [NSColor whiteColor];

            return whiteColor.get();

        }

        default: {

            const int cacheSize = 32;

            static unsigned cachedRGBAValues[cacheSize];

            static RetainPtr<NSColor> cachedColors[cacheSize];

            for (int i = 0; i != cacheSize; ++i)

                if (cachedRGBAValues[i] == c)

                    return cachedColors[i].get();

#ifdef COLORMATCH_EVERYTHING

            NSColor* result = [NSColor colorWithCalibratedRed:color.red() / 255.0f

                                                        green:color.green() / 255.0f

                                                         blue:color.blue() / 255.0f

                                                        alpha:color.alpha() /255.0f];

#else

            NSColor* result = [NSColor colorWithDeviceRed:color.red() / 255.0f

                                                    green:color.green() / 255.0f

                                                     blue:color.blue() / 255.0f

                                                    alpha:color.alpha() /255.0f];

#endif

            static int cursor;

            cachedRGBAValues[cursor] = c;

            cachedColors[cursor] = result;

            if (++cursor == cacheSize)

                cursor = 0;

            return result;

        }

    }

}

static CGColorRef CGColorFromNSColor(NSColor* color)

{

    // This needs to always use device colorspace so it can de-calibrate the color for

    // CGColor to possibly recalibrate it.

    NSColor* deviceColor = [color colorUsingColorSpaceName:NSDeviceRGBColorSpace];

    CGFloat red = [deviceColor redComponent];

    CGFloat green = [deviceColor greenComponent];

    CGFloat blue = [deviceColor blueComponent];

    CGFloat alpha = [deviceColor alphaComponent];

    const CGFloat components[4] = { red, green, blue, alpha };

    static CGColorSpaceRef deviceRGBColorSpace = CGColorSpaceCreateDeviceRGB();

    CGColorRef cgColor = CGColorCreate(deviceRGBColorSpace, components);

    return cgColor;

}

CGColorRef cgColor(const Color& c)

{

    // We could directly create a CGColor here, but that would

    // skip any RGB caching the nsColor method does. A direct 

    // creation could be investigated for a possible performance win.

    return CGColorFromNSColor(nsColor(c));

}

static void observeTint()

{

    ASSERT(!tintIsKnown);

    [[NSNotificationCenter defaultCenter] addObserver:[WebCoreControlTintObserver class]

                                             selector:@selector(controlTintDidChange)

                                                 name:NSControlTintDidChangeNotification

                                               object:NSApp];

    [WebCoreControlTintObserver controlTintDidChange];

    tintIsKnown = true;

}

void setFocusRingColorChangeFunction(void (*function)())

{

    ASSERT(!tintChangeFunction);

    tintChangeFunction = function;

    if (!tintIsKnown)

        observeTint();

}

Color focusRingColor()

{

    if (!tintIsKnown)

        observeTint();

    if (usesTestModeFocusRingColor())

        return oldAquaFocusRingColor;

    return systemFocusRingColor;

}

bool usesTestModeFocusRingColor()

{

    return useOldAquaFocusRingColor;

}

void setUsesTestModeFocusRingColor(bool newValue)

{

    useOldAquaFocusRingColor = newValue;

}

}

@implementation WebCoreControlTintObserver

+ (void)controlTintDidChange

{

#ifdef COLORMATCH_EVERYTHING

#error Not yet implemented.

#else

    NSColor* color = [[NSColor keyboardFocusIndicatorColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];

    WebCore::systemFocusRingColor = WebCore::makeRGBAFromNSColor(color);

#endif

}

@end